This ultralight highly, breathable and functional sweater for men performs perfectly outdoors, while running, training, and trail running. Suitable for windy and chilly conditions. At the same time, it can be worn as a comfortable post-workout outfit. High breathability gives me a feeling of freshness while active. Front and back sides have a waterproof 4-way stretch softshell fabric. In addition my freedom of movement is emphasized by elastic lycra fabrics on shoulders and sleeves. Mesh inserts speed-up sweat evaporation on perspiration’s most sensitive areas, like armpits, and between shoulder blades. "Stop-key" zippers prevent the key of bouncing up and down while active. Fluo prints for better NightVision.